EXPERIMENT 2 MEASUREMENT Flashcards
____ are necessary so that the properties and changes in matter and energy can be studied more efficiently and the results can be compaired
Definite standards of measurement
Two systems for calculation and comparison
Metric system
English system
Length (Name of unit) ( Symbol)
Mass (name of unit) (symbol)
Time ( Name of unit ) (symbol)
Temperature (name of unit) (symbol)
Meter
M
Kilogram
Kg
Second
S
Kelvin
K
(quantity) (name of unit) mol
(Quantity) (Name of unit) cd
Electric current (name of unit) A
Amount of substance
Mole
Luminous intensity
Candela
Ampere
Involve comparison to some reference standard and are subject to some degree of uncertainty
Measurement
___ is represented by hitting the bull’s eye (the accepted value)
Accuracy
___ is represented by a tight grouping of shots (they are finely tuned)
Precision
The smallest possible unit that could be measured
Precision of a measurement
Include all the digits that are known, plus one last digit that is estimated
Significant figures
The numbers that result from a measurement
Significant figures
To get the rectangular block you need to measure the (3)
Length
Width
Thickness
The ___ is = To L×W×T
Volume of a rectangular block
